1  /*
 2    twi.h - TWI/I2C library for Wiring & Arduino
 3    Copyright (c) 2006 Nicholas Zambetti.  All right reserved.
 4  
 5    This library is free software; you can redistribute it and/or
 6    modify it under the terms of the GNU Lesser General Public
 7    License as published by the Free Software Foundation; either
 8    version 2.1 of the License, or (at your option) any later version.
 9  
10    This library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14  
15    You should have received a copy of the GNU Lesser General Public
16    License along with this library; if not, write to the Free Software
17    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
18  */
19  
20  #ifndef twi_h
21  #define twi_h
22  
23    #include <inttypes.h>
24  
25    //#define ATMEGA8
26  
27    #ifndef TWI_FREQ
28    #define TWI_FREQ 100000L
29    #endif
30  
31    #ifndef TWI_BUFFER_LENGTH
32    #define TWI_BUFFER_LENGTH 32
33    #endif
34  
35    #define TWI_READY 0
36    #define TWI_MRX   1
37    #define TWI_MTX   2
38    #define TWI_SRX   3
39    #define TWI_STX   4
40    
41    void twi_init(void);
42    void twi_disable(void);
43    void twi_setAddress(uint8_t);
44    void twi_setFrequency(uint32_t);
45    uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t, uint8_t);
46    uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t, uint8_t);
47    uint8_t twi_transmit(const uint8_t*, uint8_t);
48    void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) );
49    void twi_attachSlaveTxEvent( void (*)(void) );
50    void twi_reply(uint8_t);
51    void twi_stop(void);
52    void twi_releaseBus(void);
53  
54  #endif
55